Organization and Summary of Significant Accounting Policies - Net Sales by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Net sales by Geographic Area	$ 50,376	$ 44,349	$ 141,851	$ 117,709
Percentage of Net sales by Geographic Area	100.00%	100.00%	100.00%	100.00%
United States
Segment Reporting Information [Line Items]
Net sales by Geographic Area	$ 43,689	$ 37,605	$ 117,885	$ 95,336
Percentage of Net sales by Geographic Area	86.70%	84.80%	83.10%	81.00%
Other Countries
Segment Reporting Information [Line Items]
Net sales by Geographic Area	$ 6,687	$ 6,744	$ 23,966	$ 22,373
Percentage of Net sales by Geographic Area	13.30%	15.20%	16.90%	19.00%